package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import io.swagger.models.auth.In;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

/*
* 订单
* */
@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Autowired
    private OrderMapper orderMapper;//订单mapper
    @Autowired
    private OrderDetailMapper orderDetailMapper;//订单明细mapper
    @Autowired
    private AddressBookMapper addressBookMapper;//地址信息mapper
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;//购物车mapper
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private WebSocketServer webSocketServer;


    /*
    * 用户下单
    *
    * */
    @Transactional//开启事务
    public OrderSubmitVO submit(OrdersSubmitDTO ordersSubmitDTO) {
        //异常情况处理（收货地址为空，超出配送范围，购物车为空）
        //通过地址mapper层方法。根据前端传入的id查询出地址，获得地址对象
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook ==null){
            //为空就抛异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }
        //获得购物车数据，判断购物车是否为空
        //通过拦截器获得用户id
        Long userId = BaseContext.getCurrentId();
        //创建获得购物车对象。
        ShoppingCart shoppingCart = new ShoppingCart();
        //通过id查询购物车数据
        shoppingCart.setUserId(userId);
        //调用购物车Mapper层查询方法，查询所有数据
        List<ShoppingCart> ShoppingCartList = shoppingCartMapper.list(shoppingCart);
        //判断当前用户购物车数据是否为空
        if (ShoppingCartList == null || ShoppingCartList.size()==0 ){
            //为空就抛异常
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //构造订单数据
        //获得订单实体类，并封装数据
        Orders orders = new Orders();
        //拷贝属性
        BeanUtils.copyProperties(ordersSubmitDTO,orders);
        //补全剩余属性.
        orders.setPhone(addressBook.getPhone());
        orders.setAddress(addressBook.getDetail());
        orders.setConsignee(addressBook.getConsignee());
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setUserId(userId);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setPayStatus(Orders.UN_PAID);
        orders.setOrderTime(LocalDateTime.now());

        //把数据存入到订单表中，调用订单Mapper的方法
        orderMapper.insert(orders);


        //订单明细数据
        //因为数据可能存在多条 使用集合封装
        ArrayList<OrderDetail> orderDetailList = new ArrayList<>();
        //循环遍历购物车中数据
        for (ShoppingCart cart : ShoppingCartList) {
            //创建订单明细对象
            OrderDetail orderDetail = new OrderDetail();
            //属性拷贝
            BeanUtils.copyProperties(cart,orderDetail);
            //补全数据
            orderDetail.setOrderId(orders.getId());
            //把数据封装到集合中
            orderDetailList.add(orderDetail);
        }


        //向明细表中插入n条数据，调用订单明细Mapper方法
        orderDetailMapper.insertBatch(orderDetailList);

        //清空购物车中的数据。调用购物车Mapper的方法
        shoppingCartMapper.deleteByUserId(userId);

        //封装返回结果
        OrderSubmitVO build = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderAmount(orders.getAmount())
                .orderNumber(orders.getNumber())
                .orderTime(orders.getOrderTime())
                .build();

        return build;
    }






    /*
    * 历史订单查询
    *用户端订单分页查询
    * */
    @Override
    public PageResult pageQueryUser(int page, int pageSize, Integer status) {
        //设置分页
        PageHelper.startPage(page,pageSize);
        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        //将用户id和状态封装进去
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        //分页条件查询。调用mapper层方法，将数据插入查询

        Page<Orders>page1 =orderMapper.pageQuery(ordersPageQueryDTO);
        //创建list集合，泛型为返回对象
        List<OrderVO> list = new ArrayList<>();
        //循环遍历数据，并将数据封装
        if (page1 != null &&page1.getTotal()>0 ){
            for (Orders orders : page1) {
                Long ordersId = orders.getId();//订单id

                //查询订单明细,,调用订单明细mapper层方法
                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(ordersId);

                //属性转换，将数据封装到OrderVO中，并就行响应
                OrderVO orderVO = new OrderVO();
                //属性拷贝
                BeanUtils.copyProperties(orders,orderVO);
                //补全属性
                orderVO.setOrderDetailList(orderDetails);

                list.add(orderVO);
            }
        }

        return new PageResult(page1.getTotal(),list);
    }



    /*
    * 查询订单详情
    *
    * */
    @Override
    public OrderVO detail(Long id) {
        //调用订单mapper层方法。根据id查询数据
        Orders orders = orderMapper.getById(id);
        //掉用订单明细层mapper方法，查询对应的菜品/套餐信息
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        //将订单和明细封装到OrderVO中并返回响应
        OrderVO orderVO = new OrderVO();
        //属性拷贝
        BeanUtils.copyProperties(orders,orderVO);
        orderVO.setOrderDetailList(orderDetailList);

        return orderVO;
    }



    /*
    * 取消订单
    * */
    @Override
    public void userCancelById(Long id) throws Exception {
        //根据id查询订单。
        Orders ordersDB = orderMapper.getById(id);

        //校验订单是否存在
        if(ordersDB == null){
            //不存在, 进if，抛异常
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        //订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        //判断订单状态
        if (ordersDB.getStatus()>2){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());

        //订单处于待接单状态下取消。需要退款
        if(ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)){
            //调用微信支付退款接口
            weChatPayUtil.refund(
                    ordersDB.getNumber(),//商户订单号
                    ordersDB.getNumber(),//商户退款单号
                    new BigDecimal(0.01),//退款金额，单位：元
                    new BigDecimal(0.01));//原订单金额

            //修改支付状态为  退款
            orders.setPayStatus(Orders.REFUND);

        }

        //更新订单状态，取消原因，取消时间
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);

    }




    /**
     * 再来一单
     *
     * @param id
     */
    public void repetition(Long id) {
        // 查询当前用户id
        Long userId = BaseContext.getCurrentId();

        // 根据订单id查询当前订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // 将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        // 将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }




    /*
    *订单搜索
     @param ordersPageQueryDTO
     @return
    */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        //设置分页
        PageHelper.startPage(ordersPageQueryDTO.getPage(),ordersPageQueryDTO.getPageSize());

        //分页条件查询。调用mapper层方法，将数据插入查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        //部分订单状态，需要额外返回订单菜品信息，将Order转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(),orderVOList);
    }



    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        //需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)){
            for (Orders orders : ordersList) {
                //将相同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                //属性拷贝
                BeanUtils.copyProperties(orders,orderVO);
                String orderDishes = getOrderDishesStr(orders);

                //将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }


    /*
    * 根据订单id获取菜品信息字符串
    * */
    private String getOrderDishesStr(Orders orders) {
        //查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());
        //将每一天订单菜品信息拼接为字符串（格式：宫保鸡丁*3）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());
        //将该订单对应的所有菜品信息拼接在一起
        return String.join("",orderDishList);

    }




    /*
    * 各个状态的订单数量统计
    *
    * */
    @Override
    public OrderStatisticsVO statistics() {
        //根据状态，分别查询出待接单，待派送，派送中的订单数量
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.COMPLETED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);
        //将查询出来的数据封装到orderStatisticsVO中响应
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);

        return orderStatisticsVO;
    }



    /*
    * 接单
    * */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();

        orderMapper.update(orders);
    }







    /*
    * 拒单
    * */
    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception {
        //根据id查询订单
        Orders ordersDB = orderMapper.getById(ordersRejectionDTO.getId());
        //订单只有存在且状态为2（待接单） 才可以拒单
        if (ordersDB ==null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        //支付状态
        Integer payStatus = ordersDB.getPayStatus();
        if (payStatus==Orders.PAID){
            //用户已支付  需要退款
            String refund = weChatPayUtil.refund(
                    ordersDB.getNumber(),
                    ordersDB.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));
                    log.info("申请退款：{}",refund);

        }
        //拒单需要退款，根据订单id更新订单状态。拒单原因。取消时间
        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        orders.setStatus(orders.CANCELLED);
        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.update(orders);
    }



    /**
     * 取消订单
     *
     * @param ordersCancelDTO
     */
    public void cancel(OrdersCancelDTO ordersCancelDTO) throws Exception {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());

        //支付状态
        Integer payStatus = ordersDB.getPayStatus();
        if (payStatus == 1) {
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    ordersDB.getNumber(),
                    ordersDB.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));
            log.info("申请退款：{}", refund);
        }

        // 管理端取消订单需要退款，根据订单id更新订单状态、取消原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersCancelDTO.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason(ordersCancelDTO.getCancelReason());
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }



    /**
     * 派送订单
     *
     * @param id
     */
    public void delivery(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        // 校验订单是否存在，并且状态为3
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为派送中
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);

        orderMapper.update(orders);
    }



    /**
     * 完成订单
     *
     * @param id
     */
    public void complete(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        // 校验订单是否存在，并且状态为4
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为完成
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());

        orderMapper.update(orders);
    }





}
